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if you borrowed $9,000 for 6 months at 10% annual simple
interest, how much must you repay at the end of the 6 months

$9450

Step-by-step explanation:

We will use compound interest formula:

Where

F is future amount [what we want to figure out]

P is present amount [9000]

r is rate of interest [since we want for 6 months, the annual interest divided by 2 is r. So r = 10/2 = 5% or 0.05]

t is the time [ the time period is for 6 months so t = 1 since we already converted the interest rate to 6 month chunk]

Putting in formula, we get:

Using stratified sampling concepts, it is found that the correct options are:

Stratified sampling divides the population into groups, called stratas, and a few elements of each group are surveyed.

In this problem, the households are divided to represents various locations, ethnic groups, and income brackets, hence, those are the stratas.

Stratified sampling is used because ensures that all segments of the population are represented.

You can learn more about stratified sampling at link